Gm Mode 22 Scan Tool By Terry

You need a program that understands Terry’s Mode 22 definitions. The classic choices are:

Plug your ELM327 scanner into the car's OBD-II port (usually located under the steering wheel).

Modern generic scan tools do not speak "Mode 22" because the addresses (e.g., $22 $04 for RPM) changed based on the vehicle’s PROM (Programmable Read Only Memory) mask ID. gm mode 22 scan tool by terry

: Torque Pro (Android) or OBD Fusion allow you to manually enter "Custom PIDs" to replicate Mode 22 functionality.

: Using a high-quality Bluetooth OBD2 scanner provides faster data rates than the original serial-port tools of Terry's era. You need a program that understands Terry’s Mode

Using this software generally follows the standard procedure for PC-based OBD-II diagnostics: Hardware Connection:

Launch the application to begin reading manufacturer-specific trouble codes and live data streams. www.yppta.com.cn : Torque Pro (Android) or OBD Fusion allow

Before we discuss the tool itself, we need to understand the language of the GM ECM. On pre-1996 GM vehicles (OBD1), the ECM communicated over a 160-baud or 8192-baud ALDL (Assembly Line Diagnostic Link) connection.